Heat-resisting cement



6. COMPOSITIONS Eiamin COATING R PliASTIC. V a

UCNWITEDWSTATES PATENT OFFICE.

HAROLD S. ASHENHURS'I, OF CHICAGO, ILLINOIS.

HEAT-BESISTING CEMENT.

1,365,077. Specification of letterslatent Patented Jan. 11, 1921.

No Drawing. Application filed September 24, 1919. Serial No. 326,103.

To allwlzom it may concern: to highly heatel surfacesmfiron d t l Be it known that I, HAROLD S. AsHEN- I have emp oye tie nitrates of sodium. 0- HURST, a citizen of the United States and tassium and ammonium the sulfates of resident of Chicago, in the county of Cook aotassmm. sodium and ammonium and the 60 and State of Illinois, have invented certain chloride of sodium ammonlum. calcium and new and useful Improvements in Heat-Restrontium. Ihe quantity of these substances sisting Cements, of which the following is a added to the asbestos cement heretofore despecificatiom scribed should be approximately 4% per My inventlon relates to cements and parcent. although from 5 to per cent. may be 10 ticularly to a fire resisting cementitious inused with good results. This is added in sulating substance adapted to be applied the dry state and the material is shipped in and adhere to hot surfaces. this form. On the addition of water the a It is well known that cements are required soluble salt goes into solution and permeates l which will withstand the action of heat and the entire mass. \Vhen the cement is ap- 15 it is desirable in connection with such ceplied to a hot iron surface the salt-bearing A ments that they adhere tightly to the sursolution contacts the highly heated iron and faces with which they are in contact. a plurality of reactions, both primary and In preparing the cement which forms the secondary, are believed to occur. At any subject-matter of this invention I utilize rate, there is immediately formed as the re- 2O asbestos in the peculiar form covered in my sult of the reaction an iron oxid, either mo. 1,31(,853, dated October 7, 1919, the red or the black oxid, usually the latter. as the. principal constituent. This sub- The oxid in the form of scale seems to comstance, as described in the application rebine mechanically with the short fibers of ferred to, is prepared from the waste asthe cement and firmly fix the cement there- 25 bestos sand of the mills which produce this to. In other words, the salt either with or substance and consists of the double silicate without the cooperation of the soluble subof calcium and ma nesiumm' stances contained in the cement acts as a Womble matter flux for the iron and forms a tightly adhersome of which is in the form of soluing scale within which the projecting fibers 30 ble silicates. The substance is relm of the cement are embedded. This result ne y 1V1 ed andof such physical charmay be secured by reason of hydrolytic acacteristics that it has a weight of twentytion but as the exact theory is not known five to fifty pounds per cubic foot. On and as the theory is not essential in order the addition of water to this substance to secure the desired result, I will not herein 85 the soluble matfmssolved and evenly attempt to explain it. In practice the user distributed throughout the mass. A mild will employ the chemical which may be most reaction occurs which results in theformacheaply procured and the quantity emtion of silica crystals which serve to bind ployed will be substantially the same in all the mass together thereby providing a cecases. While I have not made extensive ex- 40 ment having the capacity of resistance to periments with other soluble, substantially extreme heat, which will not crack and neutral salts than those herein specified, I which is very cheaply prepared. believe that any salt of this description However, notwithstanding the many dewhich has the capacity of ready dissociasirable features of this cement, it will not tion at low temperatures in the presence of 45 adhere to hot surfaces; that is, surfaces havwater and iron will accomplish the desired ing a temperature as high as 600 to 800 F., result. As stated, however, that salt will be and it is highly desirable that a cement of employed which may be most cheaply prothis character should have such a characcured and in many instances sodium chlorid teristic. To that end I have by numerous will be found to possess the required fea- 1 60 experiments discovered that with the additures of advantage. tionrofa small quantity ofasoluble neutral It must not be assumed that asbestos in 1 salt, such as the nitrates sulfates and any form when combined with a soluble chlorides. I am able to produce a cement n salt will produce the desired result. The

which none of the valuable features heretocementitious action in the body of the ma- 55 fore referred to are lost and which has in terial must be the same whether it is to be addition the characteristic of adhesiveness applied to hot or cold surfaces and it follows therefore that the material with which the soluble salt is combined must be a cement 2e? 86 and must possess the ability to resist lieat Without change in form.

One of the particular advantages in the use of the composition here disclosed is that it may be formed and shipped in a dry state, requiring only the addition of water in order to produce the desired cement. This results in a material saving to the consumer, due to the reduction in the cost of shipping. Furthermore, the substance does not deter1-' orate or harden after the container has been opened and exposed to the air. A reduction of expense is also possible in the cost of cans or containers as it is not essential that the air be excluded from the material.

My invention comprehends the employment of any of the salts of the specified description within the limit of proportions named and I do not wish to be limited except as indicated in the appended claims.

I claim:

1. A new composition of matter composed of finely divided asbestos having weight of twenty-five to fifty pounds per cubic foot, a water-soluble salt, and water, combined as set forth.

2. A cementitious substance adapted to adhere to highly heated surfaces consisting of the finely ground double silicate of calcium and magnesium containing an appreciable quantity of water-soluble matter, and sodium chlorid, substantially as herein described.

3. A cementitious substance adapted to adhere to highly heated iron consisting of asbestos in such condition as to form a cement when combined with water, and sodium chlorid, substantially as described.

4. A cementitious substance adapted to adhere to highly heated surfaces consisting of the finely ground double silicate of calcium and magnesium containing an appreciable quantity of water-soluble matter, and a water-soluble salt, substantially as described.

5. A composition of matter composed of dry solids and consisting of the finely ground double silicate of calcium and magnesium as produced from the waste of asbestos mills, and a water-soluble salt, said composition when combined with water being adapted in and of itself to form a cement which will adhere to highly heated surfaces, substantially as described.

Signed at Chicago, Illinois, this 22nd day of Sept, 1919.

HAROLD S. ASHENHURST.

Witness T. D. BUTLER. 

